Ok this is the first time this has happened to me...I am a 20 yr virgin (so I know I'm not pregent), I'm not on the pill and I have irregular periods.... I will not have one for 2-3 months but then get a HEAVY one... well I had one this month that was heavy from 3/4-3/13 but a few weeks later I had brown discharge (like old blood from old cycles, l normally have at the end of my cycle) and it seems like a started a light period from 3/27- present.... why? or what are some causes?